Electric or electronic sensors for sensing the presence, absence or movement of automobiles in, to or from a specified area or location; Object detectors and controllers sold as a unit for use on vehicles, namely laser, radar and ultrasonic detectors mounted on the top of vehicle doors for detecting the proximity of passengers or objects, and electrical controllers for controlling the closing and opening movements of the vehicle doors; Computerized management system for parking lots comprised of multiple parking space sensors for sensing the movement of persons or vehicles to determine if a parking space is available, and a computer and computer monitor with embedded software connected to the parking space sensors to record and display information about available parking spaces; Computerized speed monitoring system for vehicles comprised of a vehicle mounted GPS sensor for determining the rate of motion for a vehicle, a computer with embedded software connected to the speed sensor for receiving the sensed speed from the speed sensor, and three light emitting diode display bars for attaching to or embedding in the rear window of the vehicle for displaying three ranges of speeds by emitting a colored light from one of the three display bars to represent a range of speeds; computerized road condition monitoring system for vehicles comprised of four cameras for mounting on the four corners of the outside surface of the vehicle for imaging road and traffic conditions, a computer with embedded software connected to the cameras for receiving the images captured by the cameras, and four computer monitors connected to the computer for displaying the images captured by the cameras; Computerized overspeed warning system for vehicles comprised of a camera for mounting on vehicles for imaging the speed limits on speed limit road signs, a computer with embedded software connected to the camera for receiving the images captured by the camera and for recognizing the speed limit and comparing the current speed of the vehicle and the recognized speed limit, and a warning device in the nature of a visual or sound signal connected to the computer for warning the driver when the current speed is higher than the recognized speed limit